Efficient sealing and pressure maintaining structure of centrifugal fan

Abstract

The utility model belongs to the technical field of centrifugal fan equipment, and particularly relates to a centrifugal fan efficient sealing pressure maintaining structure which comprises a main body support, a control panel, a protective shell and an air outlet, the control panel is arranged at the side end of the main body support, the protective shell is arranged at the upper end of the middle of the main body support, and the air outlet is formed in the upper end of the protective shell. By arranging the double-layer turbine mechanism, the flow guide cover, the driving shaft and the auxiliary impeller, an operator controls operation of the motor through the control panel, the double-layer turbine mechanism is driven to rotate through the driving shaft after the motor is started, and the double-layer turbine mechanism drives the inner-layer impeller and the auxiliary impeller to rotate through connection of the connecting frame; the inner-layer impeller rotates to generate wind pressure in the flow guide cover, due to the facts that the front end and the rear end of the flow guide cover are both in plane design, and the driving shaft and the outer side flow guide cover structure are subjected to pure sealing treatment, the space in the flow guide cover and the rear end has efficient sealing performance, the number of holes is reduced, the sealing performance is guaranteed, meanwhile, the wind pressure is stabilized, and the operation range is enlarged.

Description

Technical Field

[0001] The utility model relates to the technical field of centrifugal fan equipment, in particular to a high-efficiency sealing and pressure-holding structure for a centrifugal fan. Background Technique

[0002] A centrifugal fan is a machine that relies on the input mechanical energy to increase the gas pressure and discharge the gas. It is a driven fluid machine. Centrifugal fans are widely used in ventilation, dust removal and cooling of factories, mines, tunnels, cooling towers, vehicles, ships and buildings; ventilation and induced draft of boilers and industrial furnaces; cooling and ventilation in air conditioning equipment and household electrical appliances; drying and selection of grains; air source of wind tunnels and inflation and propulsion of hovercrafts, etc.

[0003] The prior art has the following deficiencies: In the prior art, the one with the publication number of CN109838393B "comprises a casing and an impeller. An air inlet and an air outlet are respectively arranged on the casing. A flow guide cover is fixed on the inner wall of the casing, and the flow guide cover circumferentially surrounds the air outlet side of the impeller; a flow guide port is arranged on the side of the flow guide cover away from the air inlet, and a flow guide surface for guiding the air flow towards the flow guide port is formed on the inner wall of the flow guide cover; the flow guide cover is connected with a filter air cylinder through the flow guide port, a plurality of filter air holes are uniformly arranged on the inner wall of the filter air cylinder, and the external space of the filter air cylinder is communicated with the air outlet";

[0004] Through the cooperation of structures such as the flow guide cover, the impeller, and the filter air cylinder, the above equipment can purify the discharged gas and avoid environmental pollution. However, this structure does not improve the sealing treatment of the inside of the flow guide cover and the connection of the transmission structure. Using traditional bolt drilling and fixing will generate holes on the inner side of the flow guide cover, and there is a groove-like structure distributed annularly inside the existing fan structure. This kind of structure not only affects the stability of the air pressure, but also the air inlet is not specially designed, and the operation range is small. Content of the Utility Model

[0005] Aiming at the deficiencies of the prior art, the utility model provides a high-efficiency sealing and pressure-holding structure for a centrifugal fan, which solves the problems of insufficient sealing affecting the air pressure stability and small gas flow guide range existing nowadays.

[0006] To achieve the above object, the utility model provides the following technical solution: A high-efficiency sealing and pressure-holding structure for a centrifugal fan, comprising a main body bracket, a control panel, a protection shell and an air outlet. The control panel is arranged at the side end of the main body bracket. The protection shell is arranged at the upper middle part of the main body bracket. The air outlet is arranged at the upper end of the protection shell. A protection cover is arranged at the rear end of the protection shell, and a motor is arranged in the middle of the rear end of the protection cover;

[0007] A flow guide cover is arranged inside the protection shell. A double-layer turbine mechanism is arranged in the middle of the inner side of the flow guide cover. A driving shaft is arranged at the front end of the motor;

[0008] The fairing further includes an exhaust groove and a through groove. The exhaust groove is opened on the upper surface of the fairing and penetrates up and down. The through groove is opened on the middle end face of the fairing and penetrates front and back.

[0009] As a preferred technical solution of the present invention, the double-layer turbine mechanism further includes a connecting frame, an inner impeller, and an auxiliary impeller. The connecting frame is fixedly connected to the outside of the double-layer turbine mechanism and extends outward. The inner impeller is penetrated by the connecting frame and a fixed connection relationship is established. The inner side of the auxiliary impeller is fixedly connected to the end of the outer extension of the connecting frame.

[0010] As a preferred technical solution of the present invention, six groups of connecting frames are provided and are radially equidistantly distributed around the center of the double-layer turbine mechanism.

[0011] As a preferred technical solution of the present invention, six arc-shaped grooves with the same size are opened on the surface of the double-layer turbine mechanism, and the middle of the rear end is fixedly connected to the front end of the drive shaft.

[0012] As a preferred technical solution of the present invention, an inclined blade structure is provided on the inner side of the inner impeller, and a fan blade groove structure is opened on the inner side of the auxiliary impeller, and the groove structures on the inner sides of the inner impeller and the auxiliary impeller face the same direction.

[0013] As a preferred technical solution of the present invention, the front and rear end surfaces of the fairing are both processed into planes, and the position where the through groove is close to the drive shaft is sealed.

[0014] As a preferred technical solution of the present invention, the connection between the protective cover and the rear end of the protective shell and the outside of the fairing are both sealed.

[0015] Compared with the prior art, the present invention provides a high-efficiency sealing and pressure-holding structure for a centrifugal fan, which has the following beneficial effects:

[0016] The high-efficiency sealing and pressure-keeping structure of a centrifugal fan, by setting a double-layer turbine mechanism, a guide cover, a drive shaft and an auxiliary impeller. When the equipment is operating, the operator controls the operation of the motor through the control panel. After the motor starts, the double-layer turbine mechanism is driven to rotate by the drive shaft. The double-layer turbine mechanism drives the inner impeller and the auxiliary impeller to rotate through the connection of the connecting frame. The rotation of the inner impeller generates wind pressure inside the guide cover, driving the gas to flow into the guide cover. After the auxiliary impeller near the outside rotates, wind pressure is generated outside the double-layer turbine mechanism, expanding the air flow guiding range, so that a larger area of air flow is introduced into the guide cover and finally discharged from the air outlet. During the operation of the equipment, since both the front and rear ends of the guide cover adopt a flat design, and the drive shaft and the outer guide cover structure adopt a simple sealing treatment, the space inside the guide cover and the rear end has high efficiency in sealing. While reducing holes to ensure sealing, it also stabilizes the wind pressure and expands the operation range. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 Schematic diagram of the overall structure of the present invention;

[0018] Figure 2 Schematic diagram of the position of the through groove inside the guide cover of the present invention;

[0019] Figure 3 Schematic diagram of the front-end connection structure of the drive shaft of the present invention;

[0020] Figure 4 Schematic diagram of the split of the double-layer turbine mechanism of the present invention;

[0021] Figure 5 Schematic diagram of the rear-end structure of the present invention.

[0022] In the figure: 1, main body bracket; 2, control panel; 3, protective housing; 4, air outlet; 5, guide cover; 501, exhaust groove; 502, through groove; 6, double-layer turbine mechanism; 601, connecting frame; 602, inner impeller; 603, auxiliary impeller; 7, protective cover; 8, drive shaft; 9, motor. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0023] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0024] Please refer to Figures 1-5, in this implementation: A high-efficiency sealing and pressure-holding structure for a centrifugal fan includes a main body bracket 1, a control panel 2, a protective housing 3, and an air outlet 4. The control panel 2 is arranged at the side end of the main body bracket 1, and the control panel 2 controls the motor 9. The protective housing 3 is arranged at the upper middle part of the main body bracket 1, and the protective housing 3 provides protection for the guide cover 5. The air outlet 4 is arranged at the upper end of the protective housing 3, and the air outlet 4 serves as a channel for gas discharge. A protective cover 7 is arranged at the rear end of the protective housing 3, and the protective cover 7 protects the rear end of the device. In the middle of the rear end of the protective cover 7, there is a motor 9, and the motor 9 drives a double-layer turbine mechanism 6;

[0025] Inside the protective housing 3, there is a guide cover 5. The guide cover 5 conveys gas to the air outlet 4. In the middle of the inside of the guide cover 5, there is a double-layer turbine mechanism 6. The double-layer turbine mechanism 6 can increase the range of airflow introduction. At the front end of the motor 9, there is a drive shaft 8, and the drive shaft 8 conducts the power of the motor 9;

[0026] The guide cover 5 further includes an exhaust groove 501 and a through groove 502. The exhaust groove 501 is opened on the upper surface of the guide cover 5 and penetrates up and down. The through groove 502 is opened on the middle end surface of the guide cover 5 and penetrates front and back.

[0027] In this embodiment, the double-layer turbine mechanism 6 further includes a connecting frame 601, an inner impeller 602, and an auxiliary impeller 603. The connecting frame 601 is fixedly connected to the outside of the double-layer turbine mechanism 6 and extends outward. The inner impeller 602 is penetrated by the connecting frame 601 and a fixed connection relationship is established. The inner side of the auxiliary impeller 603 is fixedly connected to the end of the outer extension of the connecting frame 601; There are six groups of connecting frames 601, and they are radially equidistantly distributed around the center of the double-layer turbine mechanism 6;

[0028] Specifically, by setting six groups of connecting frames 601, the inner impeller 602 and the auxiliary impeller 603 can be stably connected, so that the overall double-layer turbine mechanism 6 maintains a stable connection;

[0029] In this embodiment, six arc-shaped grooves with the same size are opened on the surface of the double-layer turbine mechanism 6, and the middle part of the rear end is fixedly connected to the front end of the drive shaft 8; There is an inclined blade structure on the inner side of the inner impeller 602, and a fan blade groove structure is opened on the inner side of the auxiliary impeller 603, and the groove structures on the inner sides of the inner impeller 602 and the auxiliary impeller 603 face the same direction;

[0030] Specifically, by opening arc-shaped grooves on the outside of the double-layer turbine mechanism 6, the lateral area of the double-layer turbine mechanism 6 can be reduced, the airflow passage range can be increased, and the airflow introduction speed can be increased;

[0031] In this embodiment, the front and rear end surfaces of the fairing 5 are both treated with a flat surface, and the position of the through groove 502 close to the drive shaft 8 is treated with a seal; the connection between the protective cover 7 and the rear end of the protective housing 3 and the outer side of the fairing 5 are both treated with a seal.

[0032] The working principle and usage process of the present utility model: When the device is operating, the operator controls the operation of the motor 9 through the control panel 2. After the motor 9 is started, the double-layer turbine mechanism 6 is driven to rotate by the drive shaft 8. The double-layer turbine mechanism 6 drives the inner impeller 602 and the auxiliary impeller 603 to rotate through the connection of the connecting frame 601. The rotation of the inner impeller 602 generates wind pressure inside the fairing 5, driving the gas to flow into the interior of the fairing 5. After the rotation of the auxiliary impeller 603 near the outside, wind pressure is generated outside the double-layer turbine mechanism 6, expanding the air flow guiding range, so that a larger area of air flow is introduced into the interior of the fairing 5 and finally discharged from the air outlet 4. Since the traditional grooving structure inside this structure is replaced by a flat surface covering, the wind pressure is stabilized and the sealing performance is increased.

[0033] Finally, it should be noted that the above are only the preferred embodiments of the present utility model and are not used to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. An efficient sealing and pressure-holding structure for a centrifugal fan, comprising a main body bracket (1), a control panel (2), a protective housing (3), and an air outlet (4). The control panel (2) is arranged at the side end of the main body bracket (1), the protective housing (3) is arranged at the upper middle part of the main body bracket (1), the air outlet (4) is arranged at the upper end of the protective housing (3), and a protective cover (7) is arranged at the rear end of the protective housing (3). A motor (9) is arranged in the middle of the rear end of the protective cover (7). It is characterized in that: A flow guide cover (5) is arranged inside the protective housing (3), and a double-layer turbine mechanism (6) is arranged in the middle of the inside of the flow guide cover (5). A drive shaft (8) is arranged at the front end of the motor (9); The flow guide cover (5) further comprises an exhaust groove (501) and a through groove (502). The exhaust groove (501) is opened on the upper surface of the flow guide cover (5) and runs through up and down. The through groove (502) is opened on the middle end face of the flow guide cover (5) and runs through front and back.

2. The high-efficiency sealing and pressure-holding structure of a centrifugal fan according to claim 1, characterized in that: The double-layer turbine mechanism (6) further comprises a connecting frame (601), an inner impeller (602), and an auxiliary impeller (603). The connecting frame (601) is fixedly connected to the outside of the double-layer turbine mechanism (6) and extends outward. The inner impeller (602) is penetrated by the connecting frame (601) and a fixed connection relationship is established. The inner side of the auxiliary impeller (603) is fixedly connected to the end of the outer extension of the connecting frame (601).

3. The high-efficiency sealing and pressure-holding structure of a centrifugal fan according to claim 2, characterized in that: Six groups of the connecting frames (601) are provided and are radially and equidistantly distributed around the center of the double-layer turbine mechanism (6).

4. The high-efficiency sealing and pressure-holding structure of a centrifugal fan according to claim 1, characterized in that: Six arc-shaped grooves with the same size are opened on the surface of the double-layer turbine mechanism (6), and the middle part of the rear end is fixedly connected to the front end of the drive shaft (8).

5. The high-efficiency sealing and pressure-holding structure of a centrifugal fan according to claim 2, characterized in that: An inclined blade structure is arranged inside the inner impeller (602), and a fan blade groove structure is opened inside the auxiliary impeller (603), and the groove structures inside the inner impeller (602) and the auxiliary impeller (603) face the same direction.

6. The high-efficiency sealing and pressure-holding structure of a centrifugal fan according to claim 1, characterized in that: The front and rear end surfaces of the flow guide cover (5) are both processed into planes, and the position of the through groove (502) close to the drive shaft (8) is sealed.

7. The high-efficiency sealing and pressure-holding structure of a centrifugal fan according to claim 1, characterized in that: The connection between the protective cover (7) and the rear end of the protective housing (3) and the outside of the flow guide cover (5) are both sealed.

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